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Re: launch issues
[Re: tboomer]
#1022158
07/04/11 06:43 PM
07/04/11 06:43 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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Sorry to flog a dead horse but managed to find a better pic.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues
[Re: deaks]
#1022159
07/04/11 06:57 PM
07/04/11 06:57 PM
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Joined: Jan 2003
Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,155
Frostbitefalls MN (Rocky&Bullw...
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Is it possible your rear shocks are too short? The rear looks very high to me, might be unloading the tires when they extend fully?
Last edited by gregsdart; 07/04/11 06:58 PM.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: launch issues
[Re: deaks]
#1022160
07/04/11 07:18 PM
07/04/11 07:18 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Sorry to flog a dead horse but managed to find a better pic.
Mick
A few things I would look at... shocks to soft on
extension... rear shackle angle wrong but I would
look at the shocks first... and also check the length
of the shocks... should be at least 1" longer than
the lower mount with the diff hanging with the lower
shock off the mount
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Re: launch issues
[Re: MR_P_BODY]
#1022161
07/04/11 08:16 PM
07/04/11 08:16 PM
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Joined: Mar 2009
Posts: 2,501
Sydney,Australia
tex013
master
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master
Joined: Mar 2009
Posts: 2,501
Sydney,Australia
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i'm with MrP
the rancho should be long enough,but still check.
i run the ranchos on my Satellite,i used to run at #5 or 6.
i did have inconsistant 60's,every now and again would turn the tyre for no real reason.looked at some pics,Randy Labratt helped out,tightened the ranchos ,now run #8 or 9,seemed to have helped out.ran a PB on #9.
i think the shock was too loose and sometimes on the launch would top out too early/hard and unload the tyres
best 60 is 1.540
Tex
ps : this shot is with #8 shock setting
Last edited by Tex013; 07/04/11 08:17 PM.
New best ET 10.259@129.65 .
New best MPH 130.94
Finally fitted a solid cam,
stepped it up a bit more
3690lbs through the mufflers
New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm
Power by Tex's Automotive
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Re: launch issues
[Re: 493_DART]
#1022163
07/05/11 04:04 AM
07/05/11 04:04 AM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
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master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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On this run, 60ft was 1.53, shocks on 5, 7.5 psi, hot 90 degree day, car was nearly 2/10 slow.
Rear has been lowered 1-2" and back around an inch, ranchos are RS99116 as recommended by calverts, i have just pulled the shocks off the bottom mounts with the back hanging down and the shocks extend at least another 2-3" beyond the bottom spring eye.
The rear shackles are set as the mopar book, bottom facing the rear at roughly 45 degrees with the car on the ground.
Could i have upset the ic when i made the new front hangers?.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues
[Re: deaks]
#1022164
07/05/11 04:35 AM
07/05/11 04:35 AM
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Joined: Jul 2004
Posts: 4,384
Worst Weather USA
493_DART
master
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master
Joined: Jul 2004
Posts: 4,384
Worst Weather USA
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Quote:
On this run, 60ft was 1.53, shocks on 5, 7.5 psi, hot 90 degree day, car was nearly 2/10 slow.
Rear has been lowered 1-2" and back around an inch, ranchos are RS99116 as recommended by calverts, i have just pulled the shocks off the bottom mounts with the back hanging down and the shocks extend at least another 2-3" beyond the bottom spring eye.
The rear shackles are set as the mopar book, bottom facing the rear at roughly 45 degrees with the car on the ground.
Could i have upset the ic when i made the new front hangers?.
Mick
mick-- i had weird suspension issues 2 days ago.
Our cars are so similar...
my 2 time trials were on the ss springs--the "porpousing" thing was gone--but my 60 was slow. Car did better in the 60 but it was 1.49 and 1.48 . 1st round it boiled em--1.53? , buyback it still felt weird = 1.50 . i went home . still spinning the tire 
dam car has went 1.41 - im pulling my hair out,
so i know the mental part man
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Re: launch issues
[Re: 493_DART]
#1022165
07/05/11 09:06 AM
07/05/11 09:06 AM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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I thought you had caltracs Kevin.
Were those times off the trans brake.
I feel if i can get it down to 1.40-1.42 it will go high 10.1, low 10.2.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues
[Re: deaks]
#1022166
07/05/11 09:08 AM
07/05/11 09:08 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
On this run, 60ft was 1.53, shocks on 5, 7.5 psi, hot 90 degree day, car was nearly 2/10 slow.
Rear has been lowered 1-2" and back around an inch, ranchos are RS99116 as recommended by calverts, i have just pulled the shocks off the bottom mounts with the back hanging down and the shocks extend at least another 2-3" beyond the bottom spring eye.
The rear shackles are set as the mopar book, bottom facing the rear at roughly 45 degrees with the car on the ground.
Could i have upset the ic when i made the new front hangers?.
Mick
The IC will still be the same (front spring length)
but the location of the IC would move rearward IF
you made the front hanger longer to move the axle
rearward... tire pressure might need changing...
7.5 seems low to me but thats a trial and error thing
based on the weight and tire size.... I think you
need to stiffen the shock and dont be afraid to go
to #9
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Re: launch issues
[Re: MR_P_BODY]
#1022167
07/05/11 09:12 AM
07/05/11 09:12 AM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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I#m out next week, i'm going to try 8 or 9 and at least 12psi and see what happens.
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues ( update )
[Re: 493_DART]
#1022170
07/31/11 04:39 PM
07/31/11 04:39 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
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OP
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robin hood country
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For those that are interested, took the car out this weekend to santa pod for our mopar nats. Tried the shocks on 8, tyres at 12 psi, first run off the trailer ran a new best 10.28 with a best 60ft 1.45, pulled both wheels off the floor. Later in the day similar conditions upped the tyres to 13 psi and stiffened the right shock to 9, as the car was twisting on the line, ran another pb 10.24 with a 1.44 60 ft with even more air. Day after ran another 1.44 with even more air but shifted too early and only ran a 10.33. Had a starter motor issue but all in all very pleased and a great weekend. Thanks for all the tips Mick 
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues ( update )
[Re: Thumperdart]
#1022172
07/31/11 05:07 PM
07/31/11 05:07 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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I went from 12 to 10.5 and it went from a 1.45 to 1.47, then i went up to 13 and it went 1.44.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: launch issues ( update )
[Re: deaks]
#1022175
07/31/11 08:56 PM
07/31/11 08:56 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I went from 12 to 10.5 and it went from a 1.45 to 1.47, then i went up to 13 and it went 1.44.
Mick
Good to hear its getting better... with the low pressure
you were most likely cupping the tires(less surface
area on the track)
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Re: launch issues ( update )
[Re: deaks]
#1022176
07/31/11 09:16 PM
07/31/11 09:16 PM
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Joined: Jan 2003
Posts: 3,007
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 3,007
A shed in England
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Congrats
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: launch issues ( update )
[Re: Tig]
#1022177
08/01/11 04:10 PM
08/01/11 04:10 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
master
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OP
master
Joined: May 2004
Posts: 3,210
robin hood country
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Thanks Tig and everyone else, there is youtube vid of the event with one of my runs 12 mins in but i dont know how to post it.
It's under "mopar euronats santa pod july 2011"
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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